Bait for drawing glass.



R. L. & F. J. FRINK.

BAIT FOR DRAWING GLASS.

APPLICATION FILED MAR. 10, mm.

972,687. Patented 001. 11,1910.

3 8HEETS-SHEET 1.

Wzzess ea.

R. L. & F. J. FRINK.

BAIT FOR DRAWING GLASS. APPLIOATION FILED 11,111. 10, 1916.

972,687, Patented 001;. 11,1910.

3 SHEETS-SHEET 2.

R. L. & P. J. PRINK.

BAIT FOR DRAWING GLASS.

AEPLIOATION FILED MAR. 10, 1910.

Patented Oct. 11, 1910.

3 SHEETSSHEBT 3.

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ROBERT L. FRINK AND FRED J. FRINK, OF LANCASTER, OHIO.

BAIT FOR DRAWING GLASS.

Specification of Letters Patent.

Application filed. March 10, 1910.

Patented Oct. 11, 1910.

Serial No. 548,490.

To all whom it may concern:

Be it known that we, ROBERT L. FRINK and FRED. J. FRINK, citizens of theUnited States, and residents of Lancaster, county of Fairfield, andState of Ohio, have jointly invented a new and useful Improvement inBaits for Drawing Glass, of which the following is a specification, theprinciple of the invention being herein explained and the best mode inwhich we have contemplated applying that principle, so as to distinguishit from other inventions.

The present invention relates as indicated to glass drawing mechanism,and more particularly to mechanism for drawing cylinders as in theprevailing method of manufacturing window glass. Said invention hasregard among other things to the construction of'the bait used in thusdrawing glass cylinders, involving in this respect, certain improvementsin the electrically heated glass bait that forms the subject matter ofthe copending application of R. L. Frink, filed May 20, 1909, Serial No.4L97,274L.

The object of the invention is the provision of a bait wherein thetendency of the cap or upper end of the drawn sheet or cylinder to breakaway from the bait, owing to the unequal rates of contraction of thematerial of the cylinder, namely glass, and that of the bait, which ispreferably made of metal, is substantially wholly overcome. To this endthe construction of the bait is made such, mechanically, as to permit itto contract and expand more or less freely with respect to the supportby means of which it is raised from the bath of molten glass; while atthe same time provision is made for the electrical heating of such baitso as to control, within prescribed limits, the range of temperature inthe contacting portion or novel of the glass cylinder.

The present invention comprises, in addition to the foregoing, certainaccessory or operative features of construction associated with the baitfor raising and lowering the same and for supplying thereto thenecessary heating, electrical current.

To the accomplishment of the foregoing and related ends, said invention,then, consists of the means hereinafter fully described and particularlypointed out in the claims.

The annexed drawings and the following description set forth in detailcertain mechanism embodying the invention, such disclosed meansconstituting, however, but several of the various mechanical forms inwhich the principle of the invention may be used.

In said annexed drawings :Figure 1 is a front elevation of a baitembodying our present improvements along with the cage, from which suchbait is suspended, and other accessory details; Fig. 2 is a plan view ofthe same; Fig. 3 is a side elevation thereof as viewed from the left inFig. 1; Figs. 4, 4:, 4 and 4 are sectional views of details; Fig. 5 is abottom plan view of the bait proper; Fig. 6 is a broken elevational viewof the bait showing a modification in structure from that illustrated inFig. 1; Fig. 7 is a bottom plan view of such modified form; Fig. 8 is abroken elevational view similar to Fig. 6 but showing othermodifications in construction; Figs. 9 and 10 respectively show stillother modifications in construction of the bait member proper; and Fig.11 is a sectional view more or less diagrammatic in characterillustrating such bait member proper with novel attached.

In Figs. 1, 2 and 8, the form of our improved bait there illustrated isshown in association with other portions of the glass drawing mechanismwhich, however, are so closely associated with the bait as to form ineffect, for the present, purpose, a part thereof. This mechanism, as hasbeen indicated, consisting primarily of a vertically reciprocable cage Afrom which the bait B is suspended, requires for obvious reasons, to bemounted over the drawing pot 0, whereby pot is meant any suitablereceptacle either movable or fixed in which is contained the bath ofmolten glass from which the cylinder is to be drawn. Two vertical waysor guides a are accordingly provided for such cage, which is formed toengage therewith at its respective ends, and a cable a operated by asuitable hoisting mechanism at a proper rate of speed, is similarly)rovided in connection with the cage wherey it may be thus raised andlowered. In addition to the foregoing, two electric conductors in theform of trolley wires D are provided to the rear of thepath of travel ofthe cage and parallel with said ways a.

In the approved construction illustrated, the cage comprises simply aframe made up of two transverse bars a suitably joined together andbraced by vertical bars a Two intermediately positioned vertical bars aare provided with forwardly projecting brackets a in which are formedopen trunnion bearings adapted to receive suitably formed lugs b on tworod-like arms I) that extend upwardly from the bait body. As a result ofthis construction, such body, it will be seen, is capable of oscillationin the plane of F ig.- 3. Such oscillation, however, is limited in arearward direction by a stop arm a extending downwardly from the frameof the cage into position to be engaged by the body when occupying itsnormal pendent position. Lugs 12 are adjustably held in the arms 6between nuts Z2 (see Fig. 6).

To facilitate the removal and attachment of the bait, or othermanipulation thereof, it is provided with two handles Z1 as shown inFigs. 1 and 3. The two brackets a that thus serve to support the baitbody are insulated from each other and from the frame of the cage, andare connected with the secondaries, or, in effect, themselves formcontinuations of the secondaries a; m of two transformer coils D carrieddirectly by the cage. The primaries d of such transformer lead to twotrolley arms d adapted to movably contact with the correspondinglydisposed trolley wires. Variations in the coils themselves, wherebytheir transforming effect may be adjusted, is provided for by means ofswitches (Z carried directly on the cage, while a rheostat d isintroduced into the circuit D that includes the two trolley wires, sothat the current supplied to the apparatus from the generator D or othersource of current, may also be varied in character.

The length of the ways a, between which the cage is thus movablysupported, and of the trolley wires D, will of course, depend upon thelength of cylinder which it is desired to draw. Such trolley wires,however, we prefer to have terminate at their lower ends short of thelower limit of movement of the cage, or rather of the trolley arms (Zcarried thereby; so that, in other words, such trolley arms and thetransformer carried by the cage are disconnected from the electriccircuit when such cage occupies its lowermost position in which the baitis brought into contact with the bath of molten glass in pot C.Preferably simply a breaker d is introduced into each trolley wire, inorder that the movement of the trolley arms may be in no wiseinterferred with, although various other means for interrupting theconnection through the transformer on the cage will readily suggestthemselves as a substitute for this.

Adverting next to the construction of the bait, the latter (in the formillustrated in Figs. 1 to 5, inclusive) will be seen to comprise a bodyportion of general cylindrical form which is preferably constructed ofpieces of sheet metal riveted or otherwise securely fastened together.Such body carrice the handles 6 one on its top and the other on theside, to which reference has been previously made. Such top, or cover,may also be provided, if desired, with means, as an adjustable slide 6whereby an opening of variable area is formed therein. To the lower edgeof the body portion is firmly riveted a flange of angular cross section,such flange preferably projecting outwardly from the body, and to saidflange in turn is secured the bait member If proper. The latter in theform illustrated in figures just named consists simply of an attenuatedmetal band or ribbon in the form of a continuous circle, to the upperedge of which are riveted, or better still welded, a series of bolts Z).The threaded ends of the latter are secured to, but electricallyinsulated from the flange just described as being riveted to the loweredge of the bait body, as shown in the detail section of Fig. 4 The twoarms 6 that extend upwardly from such body and pivotally support thesame from the cage, are connected at their lower ends to diametricallyopposite portions of this band, so as to have good electrical contacttherewith, (see Fig. 4) but said arms are otherwise, like the band,entirely electrically insulated from the body, the clamps 6 whereby theyare secured to the latter having bushings b of insulating material, asshown in Fig. 4.

It will thus be seen that when the bait is in its place suspended fromthe cage, and the trolley arms are in contact with the respectivetrolley wires, the electric circuit, including the dynamo and othergenerator is closed through transforming coils D, the brackets a armsI), and the bait member connected with the lower ends of the latter. Thecurrent obviously divides and flows in multiple through such bait, butcare is taken to have the respective portions thereof sub stantiallyequal in length and in cross section so that the heating effect of thecurrent thus passed therethrough is substantially uniform throughout thewhole circumferen tial extent of the band.

As a result of the manner in which the bait member proper, consisting inthe form under consideration of thin metal band or ribbon is attached tothe body portion of the bait, it will be obvious that such band is notonly electrically insulated therefrom, but substantially heat insulatedalso, by reason of the relatively small heat conducting capacity of thespaced bolts or lugs b that constitute the sole physical connectionbetween such member and body portion.

Before proceeding to discuss fully the significance of the features ofconstruction of the apparatus as thus far described, the several variantforms of the bait will be noted. Thus in Fig. 6, we illustrate in placeof a plain metal band 6 such as is shown in Fig. 5, a band 5 ofundulate, or corrugated form. Such a band, we have found will expand andcontract more readily to suit itself to the varying demands occasionedby the changes in temperature to which it is subjected, than will thesimple, plain form; and in fact, the latter after a period of use,assumes a crinkly form closely resembling that of Figs. 6 and 7. This isdue to the stretching strain produced in the band when the cylindernovel is permitted to cool, owing to the inner portion of such novelsetting with the band expanded somewhat beyond its normal circumference.The method of attachment of such undulate corrugated band is by means oflugs or bolts Z2 just as in the case of the first illustrated form. Inthe bait illustrated in Fig. 8, however, such bait being shown as ofelongated instead of cylindrical form, we utilize in place of suchbolts, a thin sheet Z) of metal relatively thinner than the band used asa bait in the two forms just considered, and considerably thinner thanthe bait here utilized, for which we employa more or less rigid ring Z9The thin sheet of metal, that serves to connect the ring, thusconstituting the bait member proper, with the lower edge of the bodyportion of the bait, is however, electrically insulated from the latterin a fashion analogous to that in which the bolts 6 are insulatedtherefrom; and furthermore, there is considerable disparity in heatconducting capacity presented by such thin strip when compared with thebait proper. This disparity is still more emphasized in the formillustrated in Fig. 9, where the connecting sheet 19 is perforated; asalso in Fig. 10 where in place of a sheet a band I) of reticulatedmaterial, preferably wire netting, takes its place.

Having thus described the general struc tural features of our improvedglass drawing mechanism with particular regard to details of the baitwhich constitutes the important feature of such mechanism, the method ofoperation of the apparatus may be next noted. The bait having been hungin the cage, is preliminarily adjusted so that the bait member liesperfectly horizontal. This adjustment is effected in a planeparallelwith the axis of the bait by raising or lowering the position oflugs Z) on the upper end of the rods or arms 5 so as to correspondinglyraise or lower the opposite sides of the bait member to which such armsare attached. A symmetrical distribution of the weight of the bait as awhole about its axis serves to level up such bait in a transverse plane,and if necessary additional weight may be attached on one side or theother to secure this result.

The cage is permitted to descend until the lower edge of the bait dipsinto the bath of glass in the drawing pot or receptacle C. in order thatthe glass may readily cling to the bait it is bestthat the latter be notraised immediately to a higher temperature than that of the atmosphere.The current is accordingly preferably not turned on until after thisstage of operation is passed and the bait with attached glass cylinder,or roller has been raised through such a distance as will permit thenovel and inclosed bait member to drop to a temperature just above thesecond point of tension in the glass. In practice the current is indeedturned on by closing switch d but despite the turning on of suchcurrent, it does not pass through the bait when in its lowermostposition, for the reason that the trolley arms are not in contact withthe live portions of the trolley wires. Such contact does not occuruntil the carriage with the bait begins to rise, so as to carry saidarms past breakers ($6, or from the dotted to the full line position, asshown in Fig. 3. The distance through which the bait thus is permittedto rise before the current is turned on, is a matter for calculation andempirical adjustment, it being our object to allow the novel, or mass ofglass that clings to the bait, to cool down to substantially thetemperature at which it is desirably maintained during the remainder ofthe draw, before any artificial heating of the bait be attempted. Aspreviously stated, the temperature at which we thus contemplatemaintaining the bait during the draw, is above the second point oftension in the glass, that is above the point where the glass comes to aset; glass men generally speaking of glass as having two points oftension, the first point being from 1200 to 1400 degrees, Fahrenheit,where devitrification or crystallization takes place, and the secondbeing in the neighborhood of 900 degrees, Fahrenheit. The volume andcharacter of the current that is passed through the bait is accordinglyregulated, having due regard to the electrical resistance of the latter,so as to maintain said bait at a temperature above such last-namedpoint, and thus enable the glass in the novel immediately contactingwith the bait to accommodate itself without rupture to any relativedisplacement of said member incident to a change in their commontemperature. This regulation of the electric circuit, and thus of thetemperature, is effected, in the first place, by adjusting thetransformer coil connection by means of switches (Z so as to providewith the current available in the main line, a current in thesecondaries, which includes in circuit therewith the bait member proper,current appropriate to the size of the bait, or in other words, the sizeof the sheet or cylinder being drawn. For varying the current during anyparticular drawing operation, with the transformer coils thus adjusted,the rheostat (Z is utilized. In place of relying on automatic means fordetermining when the current shall begin to pass through the bait uponits upward movement, after dipping in the bath of molten glass, therheostat and switch in the main circuit may be relied on, and the use ofbreakers d, or equivalent means, dispensed with.

lVhile we have illustrated (see Fig. 8) but a single form of bait asadapted to a longitudinally extended support or body member asdistinguished from a cylindrical one, it will, of course, be understoodthat any one of the several forms of such bait member is equallysusceptible of being used with a straight body as with a cylindricalbody, and as illustrated in said Fig. 8, the arms which serve to attachthe bait, are of the same form and disposition whichever type of body isutilized. The advantages, moreover, of our improved method ofelectrically heating the bait so as to control its temperature, willobviously be found in the same degree where such longitudinallyextending bait member is employed, as in the case of the cylindricalmember used in drawing rollers as distinguished from sheets.

The diagrammatic sectional view of the bait member with novel attached,shown in Fig. 11, is designed to render clear the effect of changingtemperatures in this portion of the cylinder, or sheet, of glass beingdrawn, as the case may be, and thus the significance of our improvedmethod of controlling such temperatures rendered possible by theapparatus hereinbefore described. The section of the bait member thereinappearing, is shown as inclosed to approximately the degree actuallyfound in practice by the glass forming the upper end or novel of thecylinder. Of course, both this member and the novel will initially, thatis when the member is dipped into the bath of molten glass, haveapproximately the same temperature as that of such bath. Immediately,however, the drawing process proper is begun, the member and the novelbegin to lose heat by radiation and convection, and in a limited degree,by conduction through the bolts, rivets, or equivalent means whereby themember is attached to the body portion of the bait. It has beenexplained, however, that this latter form of loss is reduced to aminimum by the construction of such attaching means. The variation intemperatures at different portions of the member and of the novel, atone stage of such cooling process, are represented on the figure inquestion. As such cooling progresses, a corresponding change occurs inthe cubical contents of three-way dimensions of both the bait member andthe novel, but owing to the different materials of which these arerespectively composed, the

band constituting the member will tend to contract more than the glass.The inner portion of the novel, is, hence, put under a compressionstrain and the outer portion u11- der a tension strain, which strains ifallowed to become too great produce a rupture of the point of attachmentof the novel to the bait. This tendency to rupture, it has beenexplained, is avoided by maintaining the temperature of the bait and theattached glass above the point at which such strains are present to aharmful degree, and in this way the glass is maintained in adhesive andcohesive contact with the bait member. This very tendency to rupture,however, upon allowing the temperature of bait and novel to fall belowsuch pre-determined point, we utilize to sever the cylinder from thebait upon the conclusion of the drawing operation. In other words, it isa matter of but a relatively few moments after the current is turned offthrough the bait, before the cylinder will snap off from the bait, andby properly controlling the resulting fracture, the rather difficulttask of severing the cylinder from the bait, involved in the prevailingpractice, is easily accomplished.

In conclusion, it may be remarked that the function of the slide 5 forproviding an adjustable opening in the body portion of the cylindricalbait is to permit regulation of the escape of the air from within theroller. This air is designed to be supplied, in the apparatus hereinillustrated, through a supply pipe 0 that rises centrally in the drawingreceptacle and is closed at its upper end by a laterally perforated cap0. The provision of an opening, whether thus adjustable or not, is ofmore significance in the case of a cylindrical bait where the spacebetween the body and the bait member is closed as illustrated inconnection with a straight, or elongated bait in Fig. 8. This opening isprovided for the purpose of regulating the escape of a predeterminedvolume of pressure medium in order to accomplish the results attained bythe construction disclosed in Patent 968,888 granted July 12th, 1910 toR. L. Frink, so that the strain on the interior wall of the cylinder maymore nearly approach those of the exterior wall, which strains areproduced by the heat loss from such walls. Thus, for example, the airmay be supplied at the upper end of the roller, instead of at the lowerend, and other changes made in the manner in which the air is supplied,as explained in U. S. Patent No. 915,282 dated March 16, 1909, whereinan earlier electrically heated bait is shown.

Other modes of applying the principle of our invention may be employedinstead of the one explained, change being made as regards the mechanismherein disclosed, provided the means stated by any one of the followingclaims or the equivalent of such stated means be employed.

We therefore.particularly point out and distinctly claim as ourinvention 1. In glass drawing mechanism, the combination of a potadapted to hold a bath of molten glass; a bait movable toward and fromsaid pot; an electric generator; and connections, including a movablecontact member, whereby an electric current may be passed through saidbait as it is thus moved.

2., In glass drawing mechanism, the combination of a pot adapted to holda bath of molten glass; a bait movable toward and from said pot;transformer coils located on a drawing support and connected with thebait; an electric generator; and connections, including a movablecontact member, whereby an electric current may be passed through saidtransformer coils and bait as the latter is thus moved.

3. In glass drawing mechanism, the combination of a pot adapted to holda bath of molten glass; a bait movable toward and from said pot;tansformer coils located on the drawing support and connected with bait;an electric generator; connections, including a movable contact memberwhereby an electric current may be passed through said transformer coilsand bait as the latter is thus moved; and means associated with saidcoils adapted to adjust the same to vary their transforming effect.

4;. In glass drawing mechanism, the combination of a pot adapted to holda bath of molten glass; a bait movable toward and from said pot;transformer coils located on the drawing support and connected with thebait; an electric generator; connections, including a movable contactmember whereby an electric current may be passed through saidtransformer coils and bait as the latter is thus moved; and rheostatmeans, apart from said bait and transformer coils, for varying thecurrent supplied to the latter.

5. In glass drawing mechanism, the combination of a pot adapted to holda bath of molten glass; a bait movable toward and from said pot;transformer coils located on the drawing support and connected with thebait; an electric generator; connections, including a movable contactmember whereby an electric current may be passed through saidtransformer coils and bait as the latter is thus moved; rheostat means,apart from said bait and transformer coils, for varying the currentsupplied to the latter; and means associated with said coils adapted toadjust the same to vary their transforming effect.

6. In glass drawing mechanism, the combination of a pot adapted to holda bath of molten glass; a bait movable toward and from said pot;transformer coils located on the drawing support and connected with thebait; an electric generator; and connections, controlled by the movementof said bait, whereby an electric current may be passed through the sameduring a predetermined portion only of its movement.

7. In glass drawing mechanism, the combination of a pot adapted to holda bath of molten glass; a bait movable toward and from said pot;transformer coils located on the drawing support and connected with thebait; an electric generator connections, including a movable contactmember whereby an electric current may be passed through saidtransformer coils and bait as the latter is thus moved; an electricgenerator; and connections, whereby an electric current may be passedthrough said bait, said connections being controlled by the movement ofbait, so as to permit the current to pass only after the latter has beenraised a predetermined distance above the metal in said pot.

S. In glass drawing mechanism, the combination of a pot adapted to holda bath of molten glass; a bait movable toward and from said pot;transformer coils located on the drawing support and connected with thebait; an electric generator; and connections including a conductorparallel with the path of movement of said bait and a contact membermovable with and connected to said bait, said conductor beingdiscontinuous so as to permit the current to thus pass during a predetermined portion only of the baits movement.

9. In glass drawing mechanism, the combination of a pot adapted to holda bath of molten glass; a bait movable toward and from said pot;transformer coils located on the drawing support and connected with thebait; an electric generator; and connections including a conductorparallel with the path of movement of said bait and a contact mem bermovable with and connected to said bait, said, conductor terminatingshort of the lower, end of said contact members range of movement so asto permit the current to pass only after the bait has been raised apredetermined distance above the metal in said pot.

10. In glass drawing mechanism, the combination of a pot adapted to holda bath of molten glass; a vertically movable cage located thereover; abait removably suspended from said cage; an electric generator; aconductor connected therewith and disposed parallel with the path oftravel of said cage; and a contact member carried by the latter andconnected with said bait, whereby an electric current may be passedthrough said bait as it is thus moved.

11. In glass drawing mechanism, the combination of a pot adapted to holda bath of molten glass; a vertically movable cage located thereover; atransformer carried by said cage, the secondaries of said transformerterminating in brackets; a bait r emovably, pivotally suspended fromsaid brackets; an electric generator; a conductor connected therewithand disposed parallel with the path of travel of said cage; and acontact member carried by the latter and connected with said bait,whereby an electric current may be passed through said bait as it isthus moved.

12. I11 glass drawing mechanism, the combination of a pot adapted tohold a bath of molten glass; a vertically movable cage locatedthereover; a bait removably suspended from said cage; an electricgenerator; a conductor connected therewith and disposed parallel withthe path of travel of said cage; and a contact member carried by thelatter and connected with said bait, whereby an electric current may bepassed through said bait as it is thus moved, said conductor beingdiscontinuous so as to permit the cur rent to pass through saidtransformer and bait during a predetermined portion only of the lattersmovement.

13. In glass drawing mechanism, the combination of a pot adapted to holda bath of molten glass; a vertically movable cage located thereover, atransformer carried by said cage, the secondaries of said transformerterminating in brackets; a bait removably, pivotally suspended from saidbrackets; an electric generator; a conductor connected therewith anddisposed parallel with the path of travel of said cage; and a contactmember carried by the latter and connected with said bait, whereby anelectric current may be passed through said bait as it is thus moved,said conductor terminating short of the lower end of said contactmembers range of movement, so as to permit the current to pass throughsaid transformer and bait only after the latter has been raised apredetermined distance above the metal in said pot.

14. Ina bait for drawing glass cylinders, the combination of a hollowsubstantially cylindrical body portion closed at its upper end, and anannular bait member, proper, attached to the open end of said bodyportion.

15. In a bait for drawing glass cylinders, the combination of a hollowsubstantially cylindrical body portion closed at its upper end, butprovided with an adjustable aperture, and an annular bait member properattached to the open end of said body por tion.

16. In a bait for drawing glass cylinders, the combination of asubstantially cylindrical body portion, an annular bait member proper,attached to but electrically insulated from the lower end of said bodyportion, and supporting arms for said body,

portion connected with said bait member so 1 as to conduct an electriccurrent thereto, said arms being also insulated from said body portion.

17. In a bait for drawing glass cylinders, the combination of asubstantially cylindrical body portion; a corrugated metallic bandconstituting the bait member proper; and means of relatively less heatconducting capacity securing said band to said body portion.

18. In a bait for drawing glass cylinders, the combination of asubstantially cylin drical body portion; a corrugated metallic bandconstituting the bait member proper; means of relatively less heatconducting capacity securing said band to said body portion; andconnections for passing a heating electric current through said band.

19. In a bait for drawing glass cylinders, the combination of asubstantially cylindrical body; a flexible corrugated metallic band,constituting the bait member proper, secured at spaced point-s along oneedge to said body, whereby the intermediate portions of said band areleft free to move relatively to each other and to said body; andconnections for passing a heating electric current through said band.

20. In glass drawing mechanism, the combination of a pot adapted to holda bath of molten glass; a bait movable toward and from said pot; anelectric generator; transformer coils movable along with said bait; andconnections whereby an electric current may be passed through saidtransformer coils and bait as the latter is thus moved.

21. In glass drawing mechanism, the combination of a pot adapted to holda bath of molten glass; a bait movable toward and from said pot; anelectric generator; transformer coils movable along with said bait;connections whereby an electric current may be passed through saidtransformer coils and bait as the latter is thus moved; and meansassociated with said coils adapted to adjust the same to vary theirtransforming effect.

22. In glass drawing mechanism, the combination of a pot adapted to holda bath of molten glass; a bait movable toward and from said pot; anelectric generator; transformer coils movable along with said bait;connections whereby an electric current may be passed through saidtransformer coils and bait as the latter is thus moved; and rheostatmeans, apart from said bait and transformer coils, for varying thecurrent supplied to the latter.

23. In glass drawing mechanism, the combination of a pot adapted to holda bath of molten glass; abait movable toward and from said pot; anelectric generator; transformer coils movable along with said bait;connections whereby an electric current may be passed through saidtransformer coils and bait as the latter is thus moved; rheostat means,apart from said bait and transformer coils for varying the currentsupplied to the latter; and means associated with said coils adapted toadjust the same to vary their transforming effect.

24. I11 glass drawingmechanism, the combination of a pot adapted to holda bath of molten glass; a vertically movable support located thereover;and a bait, having a substantially circular contact edge, pivotallyattached to said support so as to be oscillatory about an axistransverse to said supports direction of movement.

25. In glass drawing mechanism, the com bination of a pot adapted tohold a bath of molten glass; a vertically movable support locatedthereover; a bait, having a substantially circular contact edge,pivotally attached to said support so as to be oscillatory about an axistransverse to said supports direction of movement; and means limitingthe oscillation of said bait.

26. In glass drawing mechanism, the combination of a pot adapted to holda bath of molten glass; a vertically movable support located thereoverand provided with transversely alined brackets; and a bait, having asubstantially circular contact edge, pivotally suspended from saidbrackets.

27. In glass drawing mechanism, the combination of a. pot adapted tohold a bath of molten glass; a vertically movable support locatedthereover and provided with transversely alined brackets; a bait, havinga substantially circular contact edge, pivotally suspended from saidbrackets; and a stop arm extending downwardly from said support andadapted to limit the oscillation of said bait in one direction.

28. In glass drawing mechanism, the combination of a pot adapted to holda bath of molten glass; a vertically movable support located thereover;and a bait, pivotally attached to said support so as to be oscillatoryabout an axis transverse to said supports direction of movement; theopposite sides of said bait being independently adjustable with respectto such axis.

29. In glass drawing mechanism, the combination of a pot adapted to holda bath of molten glass; a vertically movable support located thereover;and a bait, having a substantially circular contact edge, pivotallyattached to said support so as to be oscillatory about an axistransverse to said supports direction of movement, the opposite sides ofsaid bait being independently adjustable with respect to such axis.

30. In glass drawing mechanism, the combination of a pot adapted to holda bath of molten glass; a vertically movable support located thereoverand provided with transversely alined brackets; a bait having asubstantially circular contact edge, and means attached to oppositesides of said bait for pivotally suspending the same from saidbrackets,said means being independently adjustable to raise or lower such sidesas desired.

31. In glass drawing mechanism, the combination of a pot adapted to holda bath of molten glass; a vertically movable support located thereoverand provided with transversely alined brackets; formed with opentrunnion bearings; a bait, comprising a sub stantially cylindrical bodyand a bait member proper secured to the lower edge of said body; armslaterally attached to said body; and lugs on the upper ends of said armsadapted to be received in bearings in said brackets.

32. In glass drawing mechanism, the combination of apot adapted to holda bath of molten glass; a vertically movable support located thereoverand provided with transversely alined brackets; formed with opentrunnion bearings; a. bait, comprising a sub stantially cylindrical bodyand a bait member proper secured to the lower edge of said body; armslaterally attached to said body; and lugs, adjustably mounted on theupper ends of said arms, adapted to be received in the bearings in saidbrackets.

83. In glass drawing mechanism, the combination of a pot adapted to holda bath of molten glass; a vertically movable cage lo cated thereover andprovided with transversely alined brackets adapted to be connected in anelectric circuit, said brackets being formed with open trunnionbearings; a bait comprising a substantially cylindrical body and a baitmember proper secured to the lower edge of said body but insulatedtherefrom, said arms being connected at their lower ends with oppositesides of said bait member; and lugs on the upper ends of said arms,adapted to be received in the bearings in said brackets.

34. In glass drawing mechanism, the combination of a pot adapted to holda bath of molten glass; a vertically movable cage located thereover andprovided with trans versely alined brackets adapted to be connected inan electric circuit, said brackets being formed with open trunnionbearings; a bait comprising a substantially cylindrical body and a baitmember proper secured to the lower edge of said body but insulatedtherefrom, said arms being connected at their lower ends with oppositesides of said bait member; and lugs, adjustably mounted on the upperends of said arms, adapted to be received in the hearings in saidbrackets.

Signed by us this 2nd day of March, 1910.

ROBERT L. FRINK. FRED. J. F RINK. Attested by F. M. ACTON, HAZELSTEVENSON.

